Volcanic Winters describe drops in global temperatures due to a massive volcanic
eruption that saturates the atmosphere with light reflecting particles which
reduces the heat generated by light from the sun. Historical examples are

1816: Mount Tambora, Indonesia, the largest eruption in 1600 years, caused
the "year without a summer"

1883: Krakatoa, Indonesia

1991: Mount Pinatubo, Phillipines

Understanding the effects of increased light reflection from atmospheric
particles can explain why, in part, the decrease temperatures after major
regional fires. Some anti-global warming advocates cite record low temperatures
as refutation of global warming. However, de facto volcanic winters from
forest fires are temporary until the soot from the fires settle out. As the
soot settles out, the CO2 warming effects become more pronounced because
of higher CO2 from the burned biomass which also reduces the amount of CO2
sequestering because there is less biomass.

A ying-yang pendulum of temperatures swings as more and larger fires generate
more temporary volcanic winters until the biomass is functionally destroyed
as a CO2 sequestering process--see
Burn, Baby, Burn.

Contributing to record low temperatures is the phenomenon of
weather sluts
where increased CO2 sublimates polar ice to generate plumes of cold "jet
streams" with denser water mass that conveys coldness further away from the
polar ice caps--see polar
time bomb.

As has been repeatedly stated, the real impact of increasing CO2 on humanity
will be the destruction of the
foodchain. As was seen
most horribly in the year with no summer, no food grows when it is very,
very cold. In summary, the ways that CO2 destroys the foodchain and biomass
are: